* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  line-height: 1.6;
}

header {
  background-color: #f4a460;
  padding: 1rem;
}

nav ul {
  display: flex;
  list-style: none;
  justify-content: center;
}

nav ul li {
  margin: 0 1rem;
}

nav ul li a {
  text-decoration: none;
  color: #333;
  font-weight: bold;
}

main {
  padding: 2rem;
}

section {
  margin-bottom: 2rem;
}

h1, h2 {
  margin-bottom: 1rem;
}

button {
  padding: 0.5rem 1rem;
  font-size: 1rem;
  cursor: pointer;
  background-color: #7f8c8d;
  color: #fff;
  border: none;
  border-radius: 5px;
}

footer {
  background-color: #f4a460;
  padding: 1rem;
  text-align: center;
}

@media screen and (max-width: 768px) {
  nav ul {
    flex-direction: column;
  }

  nav ul li {
    margin: 0.5rem 0;
  }
}